Saylor has been relentless in buying BTC no matter what the price is or what the market sentiment is
While everyone is pessimistic about Bitcoin's price, others see opportunities, and with cash available, it's usually those who will make the most money in the future
I don't know how much he'll be able to buy, as it depends on a few factors, mainly how much he's able to borrow or sell shares in the company to buy BTC, but it looks like he's still a long way from finishing his purchases